docs: Product key (#1182)

readme.md

@@ -203,15 +203,6 @@ kubectl apply -f https://raw.githubusercontent.com/dockur/windows/refs/heads/mas
     KEYBOARD: "en-US"
   ```
 
-### How do I set the product key?
-
-  By default, an evaluation version of Windows will be installed, but if you have a product key you can add a `KEY` variable like this (before installation):
-
-  ```yaml
-  environment:
-    KEY: "xxxxx-xxxxx-xxxxx-xxxxx-xxxxx"
-  ```
-
 ### How do I select the edition?
 
   Windows Server offers a minimalistic Core edition without a GUI. To select those non-standard editions, you can add a `EDITION` variable like this (before installation):